'Sound' in the Bible

And Elisha sat in his house, and the elders sat with him. And the king sent a man before him. Before the messenger came to him, he himself said to the elders, Do ye see how this son of a murderer has sent to take away my head? See, when the messenger comes; shut the door, and keep him off with the door: is not the sound of his master's feet behind him?

And they came and called to the porters of the city, and told them saying, We came to the camp of the Syrians, and behold, there was no one there, no sound of man, but the horses tied, and the asses tied, and the tents as they were.